Tag: water pollution

Questions Related to water pollution

Sewage ............ BOD of water.

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  1. Increases

  2. Decreases

  3. Both A and B

  4. None of the above

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Correct Option: A
Explanation:

Sewage contains the highest amount of carbonic materials and biological materials as pollutants. It increases the number of decomposers like bacteria and fungus. The acceleration of microbial activity increases BOD of water.

So, the correct answer is option A.

Which of the following algae is responsible to develop a bad taste in drinking water?

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  1. Diatoms (Golden-brown algae)

  2. Brown algae

  3. Green algae

  4. Blue green algae

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Correct Option: D
Explanation:

The foul odor and taste of the drinking water is due to geosmin and methylisoborneol that are organic compounds produced by blue-green algae. Thus the correct answer is option D.

Which among the following organisms is known as polluted water indicator?

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  1. Tubifex

  2. E.coli

  3. Chironomus larvae

  4. All of the above

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Correct Option: D
Explanation:

Water pollution is the major cause of several chronic diseases. The potable water must be treated to get rid of certain harmful microorganism. Daphnia, trout fishes, and larvae of stone flies are the example of fresh water indicator and tubifex, E. Coli, sewage fungus, sludge worms, blood worms are the indicator of polluted water.

So, the correct answer is option D.

Select the correct statement regarding water pollution.

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  1. A change in the temperature of water bodies

  2. A change in the pressure of water bodies

  3. The removal of desirable substance from water bodies

  4. Addition of undesirable substance to water bodies

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Correct Option: D
Explanation:

Addition of undesirable substances to water and removal of desirable substances from it is termed as water pollution. But the addition of harmful substances causes a very harmful effect leading to water pollution. For example, the addition of industrial smoke, effluents, washing dirty clothes, bathing, sewage waste, etc causes water pollution.

So, option D is the correct answer.

Which one of the following is a fresh water indicator organism?

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  1. Tubifex

  2. Daphnia

  3. Sludge worm

  4. All of the above

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Correct Option: B
Explanation:

Water pollution is the major cause of several chronic diseases. The potable water must be treated to get rid of certain harmful microorganism. Daphnia, trout fishes, and larvae of stoneflies are the example of freshwater indicator and tubifex, E. Coli, sewage fungus, sludge worms, blood worms are the indicator of polluted water.

So, the correct answer is option B.

Sewage infection of water will be demonstrated by cysts of

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  1. Entameoba

  2. Escherichia coli

  3. Pseudomonas

  4. Leishmania

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Correct Option: A
Explanation:
Infective forms of Entameoba, a protozoan are often passed as cysts in the faeces and humans are infected when they ingest them through the source of sewage, non-treated drinking water, flies in water supply. 
So, the correct answer is option A.

Which of the following is not found in polluted water?

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  1. Blue-green algae

  2. Larvae of stone fly

  3. Water hyacinth

  4. Sewage fungi

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Correct Option: B

Thermal pollution is more prevalent near

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  1. Hot water springs

  2. Coal-based power plants

  3. Temperature zones

  4. Tropical zones

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Correct Option: B

Which one of the following is a biodegradable pollutants?

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  1. Cowdung

  2. DDT

  3. Lead Vapour

  4. Plastic

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Correct Option: A
Explanation:

The biodegradable substances can be degraded with the decomposition activity of the microbes. The cow dung is the pollutant which is the waste produced by the animals like cattle. The cow dung mainly contains the cellulosic fibres. This is a biodegradable form of pollutant which can be decomposed by the enzyme cellulase produced by the microbes. DDT is a pesticide, the lead vapour is produced due to combustion of leaded fuels and plastic is a synthetic polymer. These materials cannot be degraded.

Thus, the correct answer is option A. 

Detergents are water pollutants because they contain.

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  1. Sulphates

  2. Nitrates

  3. Carbonates

  4. Phosphates

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Correct Option: D
Explanation:

Phosphates are used to manufacture Detergents.

When these phosphates enter water bodies, they provide nutrients resulting in algae population explosions or Eutrophication. The algae use up the entire oxygen killing other aquatic organisms.
So, the correct option is 'Phosphates'.